iOS 支持多手势 手势事件传递

//共存  A手势或者B手势 代理方法里shouldRecognizeSimultaneouslyWithGestureRecognizer   有一个是返回YES，就能共存
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}